Outlook 2010 does nothing when replying

I have one user in my organization who will occasionally attempt to reply to an email, but nothing happens. He has no mail rules configured; after restarting Outlook the functionality returns. I performed a repair and a reboot, and am currently waiting to see if these steps resolved the issue. In the meantime, what might be the cause of this? Thanks for your time.

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Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
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This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…

The viewer will learn how to simulate a series of coin tosses with the rand() function and learn how to make these “tosses” depend on a predetermined probability.
Flipping Coins in Excel: Enter =RAND() into cell A2:
Recalculate the random variable…

This Experts Exchange video Micro Tutorial shows how to tell Microsoft Office that a word is NOT spelled correctly. Microsoft Office has a built-in, main dictionary that is shared by Office apps, including Excel, Outlook, PowerPoint, and Word. When …